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"About This Computer" Mac OS 9.1 window showing the memory consumption of each open application and the system software itself. Historically, the classic Mac OS used a form of memory management that has fallen out of favor in modern systems. Criticism of this approach was one of the key areas addressed by the change to Mac OS X.
Mac OS X Tiger through Mac OS X Snow Leopard support PAE and the NX bit on IA-32 processors; Snow Leopard was the last version to support IA-32 processors. On x86-64 processors, all versions of macOS use 4-level paging (IA-32e paging rather than PAE) to address memory above 4GB. Mac Pro and Xserve systems can use up to 64 GB of RAM. [23]
Internally, Core Foundation forms the base of the types in the Objective-C standard library and the Carbon API. [ 1 ] The most prevalent use of Core Foundation is for passing its own primitive types for data, including raw bytes , Unicode strings , numbers , calendar dates , and UUIDs , as well as collections such as arrays , sets , and ...
HFS Plus is still supported by current versions of Mac OS, but starting with Mac OS X, an HFS volume cannot be used for booting, and beginning with Mac OS X 10.6 (Snow Leopard), HFS volumes are read-only and cannot be created or updated. In macOS Sierra (10.12), Apple's release notes state that "The HFS Standard filesystem is no longer supported."
In Mac OS X 10.0, the first release of macOS, it was renamed System Profiler; with the release of Mac OS X 10.7 "Lion" it was again renamed to System Information. [68] Other new features in Lion are the ability to look up support information for the user's hardware model as well. [69]
XNU ("X is Not Unix") is the computer operating system (OS) kernel developed at Apple Inc. since December 1996 for use in the Mac OS X (now macOS) operating system and released as free and open-source software as part of the Darwin OS, which, in addition to being the basis for macOS, is also the basis for Apple TV Software, iOS, iPadOS, watchOS, visionOS, and tvOS.
Target Disk Mode (sometimes referred to as TDM or Target Mode) is a boot mode unique to Macintosh computers. When a Mac that supports Target Disk Mode [1] is started with the 'T' key held down, its operating system does not boot. Instead, the Mac's firmware enables its drives to behave as a SCSI, FireWire, Thunderbolt, or USB-C external mass ...
Mavericks was the first OS X release to be named after a location in California, and the first to be a free upgrade since Mac OS X 10.1 Puma. [7] [8 ... Memory is a ...